Dental syringe



Apr. 17, 1923. 1,452,085

D. J. MACHOL DENTAL SYRINGE Filed Oct. l5, 1921 +/f x ff i 55: ffff Patented Apr. 17, 1923.

PATENT OFFICE.

DAVID J. MACHOL, F WEST NEW BRIGHTON, NEW YORK.

DENTAL SYRINGE.

Application led October 15, 1921. Serial No. 507,881.

T o all 1e hom it mail concern Be it known that I, DAVID J. MAcHoL, a citizen of the United States, residing at Test New Brighton, county. of Richmond, State of New York, have invented certain new and useful Improvements in Dental Syringes, of

which the-following is a full, clear, and ex-.

act description.

This invention relates to improvements in dental syringes, one of the objects being to provide a syringe arranged for the purposes of cleansing cavities in t e teeth or for whatever use in connection with the treatment of the" teeth that/may be necessary or desirable. During the operation of treating the teeth, more' especially filling the cavities are 'j cleansed with warm water, and are also subjected to treatment by warm air. My improvedfsyringe is designed for attachment to a vWater supply, a water faucet, or dental fountain and includes 'a heater through which thewater Passes on its Way to the CII syringe' nozzle, the heater containing a heating element, such as an electrical resistance, which acts to heat the water. The casing containing the heat is also arranged for the introduction thereinto of air under pressure, special means being provided to connect the air chamber with the nozzle member of the syringe for the purpose of introducing warm air into a cavity of a tooth, if desirable. In other words, lmy improved syringe is arranged to introduce either warm water or warm air into the cavity of a tooth, the same nozzle being used for both purposes. The foregoing is a general description of my invention, a more detailed account will follow.

In the drawing which forms part of this specification,

Fig. 1 is a sectional view, partly in elevation of my improved syringe;

Fig. 2 is an end view thereof, looking from the left in Fig. 1, certain parts being omitted;

Fig. 3 is an enlarged sectional view illustrating the associated airV and water ducts and valves; and

Fig. 4 is a sectional view of the nozzle member, the section being taken on a line 4-4 in Fig. 1.

As herein embodied, my invention is made up of a heater 5, a nozzle member 6 and a duct or flexible tube 7, which Connects the nozzle and heater` Further elements of the device are a duct or fiexible tube 8 to conneet the heater with a source of water supply, and a duct or iexible tube,9 connecting the heater and source of compressed air supply. The water and air supply have not been illustrated, but the tube 8 may be connected to a water faucet, a dental fountain, or any other-source. The tube 9 may be connected to a tank, containing compressed air or a foot pump. .The heater consists of a casing l() havinga bracket 11 by which means, and screws 12, the heater can be permanently fastened to any element adjacent the dental chair, such for instance as the side of a cabinet wall, etc. The bracket 12, in this instance, includes an extension 13 which carries a switch mechanism 14, which controls the circuit for the resistance coil or heating unit l5 within the casing 10.

this instance the unit 15 is tubular, the Water passing through the bore 16. The unit 15 is supported by cones 17, 1"', preferably made of relatively soft rubber, the cones 17, 17', being carried by nipples 18, 18 which also carry a nut 19 threaded at 20. Each nut 19 is screwed into an opening in its adjacent head 21, the head being fitted in the ends of the casing 10. By this means I avoid the use of bolts or screws to hold the unit in place thereby eliminating, to a large extent, breakage, as the unit can be positioned within the casing, or removed therefrom by the proper manipulation of the nuts 19. The nipple 18, atvone end o thecasing, has attached thereto, the water duct 8, while the nipple 18 at the opposite end of the casing has connected therewith the duct 7 which connects the heater and nozzle (i. Strictly speaking, the nozzle 18 at its outer end is connected to a T 22 to which the duct 7 is connected, as indicated in Fig. 3. i The T 22 also carries a nipple or by-pass 23 connected at its upper end tb a casing 24 containing a valve 25, which closes or opens a port 26 in said casing. The port 26 communicates with a nipple 27 placed in communication with the air chamber 28 surrounding the heating unit 15Y The T 22 is provided with a check valve 29 which closes the opening through duct 18' when air is used. The circuit for the heating unit is controlled by the switch mechanism 14 consisting of a switch arm 29 pivoted at 30 to the extension 13. In connection with arm 29 I employ a contact 31 carried by a block of insulating material B2. The Contact 32 is llU connected'to oneend of coil 33 by a lead 34, in tliis case the negative side of the line, while the arm 29 has connected thereto the cooperating circuit Wire 35. lfVhen nosepiece 36 on arm 29 contacts with contact 31. the circuit for the coil will be closed. The arm 29 will be held in raised or circuit closing position, by a light spring 36. The spring 36 at one end is connected to arm 29, and at the other end to a lever 37 pivoted at 38to a bracket 39 carried by extension 13. When arm` 37is located to the left of a ver tical position, relative to its pivot point, spring136will act to raise arm 29. When lever 37A is positioned to lthe right of a vertic'al position, relative to the pivot point 38, Spring' 36 will not act and the arm 29 will remain in its lower-most or circuit breaking position. The nozzle member consists of a casing 39 containin a valve 40 operable by hand by means of aever 4l. The valve acts to control'I the flow of water or air through the duct 42 in casing 39. The nozzle casing 39 carries 'a hook 43 to engage switch arm 29, 'in order that said nozzle can be hung upon the switch arm when the device is not in use' thereby maintainingthe circuit for thelcoil'33'open. When the device is to be used, the nozzle 6 will be removed from the switch arm after which spring 36 will move arm 29`to close the circuitE for 1the coil; After the circuit has been closed, the Water within the unitll will become heated, after which valve will be opened by the thumb, for instance, on the hand of the operator holdingr the nozzle whereby warm water will flow from the nozzle spout 44. The tube 7 will berelatively` small as compared to the capacdf lthebore4 l6`f thel unit 15;' hence, the in'owing-Water `will -pass slowly through the-unit' and have time to become heated. Should'lthe operator desire warm air instead oflwa'ter, the vifrater supply will be turned 'off and 'valve 25op`ened.v 'When valve 25 is opened, the presshreof air will closel the check valve 29 therebyi will prevent air fromfl'win" back throughthe Water supplyducts'. efore using the nozzle for air, the operator will, of course, allow all of the Water to be forced out of duct 7 and nozzle before applying tlfe nozzle for use, that is in the event of the alternate use of Water and air. The chamber 28 may at all times contain air under pressure or may have air under pressure admitted thereto just. prior to thc use of the syringe for the application of air. Current for the coil may be obtained by plugging into a light circuit or from any suitable source of electrical supply. Should it be desirable to operate the cold water, arm 37 will be moved tothe right thereby removing allthe tension from spring 36 after which arm 29 will stay down and the circuit for the coil Will remain open.

lVhat claim and desire to secure by Letters Patent is 1. In a dental syringe, a casing closed at both ends, a tubular electrical heating element within the casing, said element being smaller in diameter than said casing to provide an air chamber around said heating element, means to pass water through said tubular heating element, means to introduce air into the vchamber around the heating elements, a nozzle, a flexible duct connecting the tubular heating element and said nozzle, means to connect the air chamber with said duct at will, and a check valve to `prevent air from flowing into the heating unit.

2. In a dental syringe, a casing closed at both ends, a. tubular electrical heating element within the casing, said element being smaller 4in diameter than said. casing to provide an air chamber around said! heating element, means to pass Water through saidtubular heating element, means to introduce air into thechamber aroundy the heating elements, a nozzle, a flexible duct connecting the tubular heatin element and Said nozzle, a supplemental uct connecting the air chamberwithisaid flexible duct, and a valve tofcontrol the flow of air into the flexible duct carried by .the supplemental duct.

3. In 'a dental syringe,fa nozzle member, anelectricalheating coil, a circuit therefor, a switch included. inithe circuit, means cai:- ried bythe nozzleito engage'l said switch to maintain said circuit open when the; switch is not in use, and manuallyoperable means to operate the switchto maintain said'circuit open independently ofsaid nozzle.

Signed at New York city, N. Y., this 29th day of September, 1921.

lVitnesses HOWARD H. WoRzEL, J AMESH. ZOBEL. 

